Malicious PDF — malware analysis report

Static analysis result for SHA-256 08757f3a7e24602c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 04:00:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 209a33552dd0ab210a3c4aea644c1ac9 SHA-1: cec5e134a8a00718365b91f7ceedea7640f24b78 SHA-256: 08757f3a7e24602cd8934eca3ef7d2718d6aeab29e40533eda1ffe2d824d62e1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized links for game-related hacks and free items. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic further supports a malicious intent to trick users into visiting potentially harmful sites. The primary attack pattern involves luring users with promises of in-game advantages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/coin-master-fan-page-free-spins-game-hack
    • http://upes.edu.sv/ckfinder/userfiles/files/hack-my-spins-coin-master_GM406889139.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/how-to-hack-someone-on-roblox-for-robux_GM431946152.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/hack-roblox-in-prison-life_GM431946152.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/free-robux-youtubecom_GM431946152.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/roblox-supreme-t-shirt-free_GM431946152.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/sites-to-get-free-robux_GM431946152.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/best-roblox-games-with-free-radio_GM431946152.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/instagram-free-coin-master-spins_GM406889139.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-free-gold-cards-link_GM406889139.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-hack-app-for-ios_GM406889139.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/claim-free-spins-coin-master_GM406889139.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/free-roblox-followers-2021_GM431946152.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/pokemon-go-kanto-free-pass_GM1094591345.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/claimrbx-free-robux_GM431946152.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/this-app-gives-you-free-robux-yt_GM431946152.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/hack-robux-2021_GM431946152.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/windows-10-minecraft-hacks_GM479516143.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-free-spins-ios-app_GM406889139.pdf
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-free-coins-and-spins-link-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031ad.bin
88d937f9c5c41ed15238603e18c8c505d37a74136fe3c5531a0fce1f11370f19
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31AD 22820 bytes
font_01_sfnt_off000064a9.bin
fc07e399d569c9cb0326c2788f4b655073573cb4c501715abae06525b94755db
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A9 18328 bytes